Dumas DeepVee20

[pribco]

Am in the process of building Dumas DeepVee20 (Dumas shought spend time in the naughty chair for the instructions.)

Question is-what motor-I want to stick with brushed as I have ESCs etc. Yeah I know brushless is faster, cost is a bit of consideration and I don't even dream about running with the big dogs.

Have used the Aquacraft brushed 550 in other boats and they work pretty good, but am wondering if there is someting faster out there. Perhaps one of the motors carried by Offshore Electric?

Will probably stick with straight shaft unless someone advises otherwise.

Thanks, Bill

[Boaterguy]

I have a no- name 640 (I think) that I can sell you for cheap, it is a little rusty on the can, but has the caps (no diode) and runs fine. I have one of the octura plastic props (purple one) that I can send you, worked well with this motor. I got everything from a friend so I don't know specs.

[Fluid]

What are your speed expectiations for the hull? As I recall that's a 24" hull of antiquated design, so it won't handle too much power. I doubt that the plans call for a 'straigh't shaft, when I built one 40 years ago (Dumas needs to sit in the chair a LONG time) I recall using an articulated driveline (precursor to flex cable).

If it were me I'd use the motor/ESC from an AquaCraft SuperVee or ProBoat BlackJack26 and a flex cable drive. Running on 4S or 12 nickel cells, performace will be all the boat can handle and the parts can be found relatively cheap used.


.

[pribco]

Fluid-not looking to run with you big dogs--just a bit faster than the aquacraft motor that I use in my Skidaddle.

Overall length is 24" but hull length is 20"

Plans show installation for either straight shaft or flex.

What about the Traxxis marine or one of the Grupner motors in offshore electics??

[FastVee]

Graupner brushed motors would not be my first choise, a friends fastech had 600bb or race and the springs that holds the brushes broke on storage! -one 10 minute run it was fine, cold can, no issues and then a week from that we tried to drive it again and nothing... -looked inside the can and brushes just rattled inside.

This could have been just one bad motor and rest would be perfect....but.... -I wont buy graupners anymore and eighter will my friend.

The traxxas could be a bit big to fit in 20" hull? -if not that could work fine.


, -but if you want to think going brushless, you can get esc and motor cheap from hc. (a smal outrunner and 125A esc about 50$) -or better ones from OSE for a bit more money.

But if you want to go cheapest route(I do that often, itś fun to see that cheap can also work well), get the 550 Traxxas and silicone cooling jacket from OSE.

Pate

[blizard05]

I used SV27 power in mine,flex shaft up tight to bottom of hull, it's a hand full,ad WOT Larry

[siberianhusky]

Mine has been both surface and submerged drive, it's faster and handles better with a surface drive. Mind you it originally had a straight shaft setup in it.
No idea for power mine has always been nitro, now it's a shelf queen, my first boat over 30 years ago. Woo Hoo Enya .19 with a kool Klamp!
I bet a 36mm motor around 2000kv or so on 4s would fit and move it right along. SV27 setup would be great.

[pribco]

OK--I have never put in anything but straight shaft so bear with me-

What is definition of "surface" and "subsurface"??

If using a flex cable what is stuffing box--some sort of flexible spring thingy--?? In other words, how is the bend accomodated?

Assume I need a strut in such an installation?

Bill

[FastVee]

Subsurface/submerged means that the prop shaft exits under the hull(usually b4 the transom). On surface drives the prop shaft exits usually from transom,and the prop is some lenght after transom.

(On some boats, like cats the surface drive can also exit under the hull, but the prop shaft still is at or close to the water line.)


The stuffing tube is usually made from brass tube and after heating it and cooling it bends like spaghetti and it´s easy to work with.

You can use just the brass tube on small boats , but strut or stinger drive would be better.

Pate

[pribco]

Gotcha, thanks--

So, if doing a surface drive, (like Siberianhusky suggests) I would set up like the Mini Rio-

Will need to offset rudder or use a "split rudder" agin like the Mini Rio.

If I do this, is flex cable better than solid shaft??

[FastVee]

You could use strudder(strut/rudder combined) ,offset rudder or dual rudders, I used single offset rudder on my mini rio and it was fine. I have center mounted rudder on my 58" apache and it is fine also. You are not racing so I say get a rudder, no matter is it mounted left,right,center or ... the important bit is that the rudder is long enough to go about an inch under the hull.(less can be enough depending how fast you want it to turn)


I would use flex shaft, easier to install and you can make small bends to the stuffing tube if needed to help installing it.

I would use a bushing inside the brass tube if you plan to use it without strut.(and thicker tube(stainless or brass) over the stuffing tube to strenghten it so it wont bend accidentally.-just from inside the transom to prop.

If this fits, it could be an option? http://cgi.ebay.com/Rudder-and-3-16-...item1e600c4aff -i have the same on my 27" supervee and it would be perfect on about 25" boat.Maybe it would work with yours also.

-Pate

[pribco]

Thanks, FastVee-you have pointed me in the right direction-

Offshore used to carry a rudder with stand off bracket that would be perfect, but don't seem to now. Poop.

[pribco]

FastVee-see you are in Finland--your lake is beautiful!!

Our exchange swtudent in high school was from Finland--she came to our 50th reunion a couple years ago--Is a surgeon in Helsinki--

[FastVee]

It´s a small world! I live in Helsinki

The "lake" is actually a sea, but it is beautiful I must admit. -and it´s only ~15 miles from Helsinki.

Glad If I was helpful, feel free to ask if you have any questions!

Pate

[rcboatmanwithkids2880]

Hi Pribco ,

Currently i am putting together a Dumas Hotshot .45 , some of the parts such as the cowl skins are too short , so i do understand your frustration . Good to be building a wooden kit though hey .....

All the best in F/E R/C Boating ,
Brad